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From: info-mac@uw-beaver (info-mac)
Newsgroups: fa.info-mac
Subject: MacPaint & Imagewriter
Message-ID: <1224@uw-beaver>
Date: Mon, 16-Jul-84 15:54:24 EDT
Article-I.D.: uw-beave.1224
Posted: Mon Jul 16 15:54:24 1984
Date-Received: Tue, 17-Jul-84 02:13:03 EDT
Sender: daemon@uw-beave
Organization: U of Washington Computer Science
Lines: 18

From: Thomas.Newton@cmu-cs-spice.arpa
I appear to be wrong about MacPaint skipping lines on the printout.  I tried
printing some horizontal lines arranged in a staircase fashion, and none of
them were missing on the printout.

The Imagewriter manual DOES say, however that vertical resolution is 72dpi
and that horizontal resolution in graphics mode is either 144dpi or 160dpi.
The Macintosh screen is roughly 80dpi.  So how does the Mac adjust for the
fact that the printer does not have the vertical resolution of the screen?

When I held a printed document to the screen, I noticed that the printed
version was slightly larger.  Apparently MacPaint is printing documents at
72dpi, which makes actual printouts about 10% larger than their size on the
screen.  Given the alternatives, this seems like a very reasonable choice.

Of course, if the Imagewriter could print 80dpi in both directions (so that
it could print things exactly as they appear on the screen) and had tractor
feed (to minimize paper shifting), none of this would ever have come up.